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Supplemental Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Statement of Income Captions [Line Items]
Net income (loss)	$ 202	$ (230)	$ 309	$ (153)
Other comprehensive income, net of tax	2	0	(5)	1
Comprehensive income (loss)	204	(230)	304	(152)
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(249)	241	(387)	197
Other comprehensive income, net of tax	(2)	0	5	(1)
Comprehensive income (loss)	(251)	241	(382)	196
Parent Guarantor | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss)	202	(230)	309	(153)
Other comprehensive income, net of tax	2	0	(5)	1
Comprehensive income (loss)	204	(230)	304	(152)
Other Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss)	0	(63)	1	(66)
Other comprehensive income, net of tax	0	0	0	0
Comprehensive income (loss)	0	(63)	1	(66)
Non-Guarantors | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss)	249	(178)	386	(131)
Other comprehensive income, net of tax	2	0	(5)	1
Comprehensive income (loss)	$ 251	$ (178)	$ 381	$ (130)

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